Camera optical lens

ABSTRACT

The present disclosure relates to the field of optical lenses and provides a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens; a second lens having a positive refractive power; a third lens having a negative refractive power; a fourth lens; a fifth lens; and a sixth lens. The camera optical lens satisfies following conditions: −10.00≤f1/f3≤−1.00; 3.00≤R5/R6≤20.00; and 100≤(R3+R4)/(R3−R4). The camera optical lens can achieve a high imaging performance while obtaining a low TTL.

TECHNICAL FIELD

The present disclosure relates to the field of optical lens, and more particularly, to a camera optical lens suitable for handheld terminal devices, such as smart phones or digital cameras, and imaging devices, such as monitors or PC lenses.

BACKGROUND

With the emergence of smart phones in recent years, the demand for miniature camera lens is increasing day by day, but in general the photosensitive devices of camera lens are nothing more than Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor), and as the progress of the semiconductor manufacturing technology makes the pixel size of the photosensitive devices become smaller, plus the current development trend of electronic products towards better functions and thinner and smaller dimensions, miniature camera lenses with good imaging quality therefore have become a mainstream in the market. In order to obtain better imaging quality, the lens that is traditionally equipped in mobile phone cameras adopts a three-piece or four-piece lens structure. Also, with the development of technology and the increase of the diverse demands of users, and as the pixel area of photosensitive devices is becoming smaller and smaller and the requirement of the system on the imaging quality is improving constantly, the five-piece, six-piece and seven-piece lens structures gradually appear in lens designs. There is an urgent need for ultra-thin, wide-angle camera lenses with good optical characteristics and fully corrected chromatic aberration.

BRIEF DESCRIPTION OF DRAWINGS

Many aspects of the exemplary embodiment can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

FIG. 1 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 1 of the present disclosure;

FIG. 2 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 1;

FIG. 3 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 1;

FIG. 4 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 1;

FIG. 5 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 2 of the present disclosure;

FIG. 6 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 5;

FIG. 7 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 5; and

FIG. 8 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 5.

DESCRIPTION OF EMBODIMENTS

The present disclosure will hereinafter be described in detail with reference to several exemplary embodiments. To make the technical problems to be solved, technical solutions and beneficial effects of the present disclosure more apparent, the present disclosure is described in further detail together with the figure and the embodiments. It should be understood the specific embodiments described hereby is only to explain the disclosure, not intended to limit the disclosure.

Embodiment 1

Referring to FIG. 1, the present disclosure provides a camera optical lens 10. FIG. 1 shows the camera optical lens 10 according to Embodiment 1 of the present disclosure. The camera optical lens 10 includes 6 lenses. Specifically, the camera optical lens 10 includes, from an object side to an image side, an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. An optical element such as an optical filter GF can be arranged between the sixth lens L6 and an image plane Si.

The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all made of a plastic material.

The second lens L2 has a positive refractive power, and the third lens L3 has a negative refractive power.

A focal length of the first lens L1 is defined as f1, and a focal length of the third lens L3 is defined as f3. The camera optical lens 10 should satisfy a condition of −10.00≤f1/f3≤−1.00, which specifies a ratio of the focal length f1 of the first lens L1 and the focal length f3 of the third lens L3. The appropriate distribution of the refractive power leads to a better imaging quality and a lower sensitivity. Preferably, −5.59≤f1/f3≤−1.08.

A curvature radius of an object side surface of the third lens L3 is defined as R5, and a curvature radius of an image side surface of the third lens L3 is defined as R6. The camera optical lens 10 further satisfies a condition of 3.00≤R5/R6≤20.00. Out of this range, a development towards ultra-thin and wide-angle lenses would make it difficult to correct the problem like an aberration. Preferably, 3.28≤R5/R6≤19.86.

A curvature radius of an object side surface of the second lens L2 is defined as R3, and a curvature radius of an image side surface of the second lens L2 is defined as R4. The camera optical lens 10 further satisfies a condition of 100.00≤(R3+R4)/(R3−R4), which specifies a shape of the second lens L2. Out of this range, a development towards ultra-thin and wide-angle lenses would make it difficult to correct the problem of the aberration. Preferably, 338.48≤(R3+R4)/(R3−R4).

A total optical length from an object side surface of the first lens L1 to an image plane of the camera optical lens 10 along an optic axis is defined as TTL. When the focal length of the first lens, the focal length of the third lens, the curvature radius of the object side surface of the second lens, the curvature radius of the image side surface of the second lens, the curvature radius of the object side surface of the third lens and the curvature radius of the image side surface of the third lens satisfy the above conditions, and the camera optical lens will have the advantage of high performance and satisfy the design requirement of a low TTL.

In this embodiment, the object side surface of the first lens L1 is convex in a paraxial region, an image side surface of the first lens L1 is concave in the paraxial region, and the first lens L1 has a positive refractive power.

The focal length of the camera optical lens 10 is f, and a focal length of the first lens L1 is f1. The camera optical lens 10 further satisfies a condition of 1.78≤f1/f≤7.02, which specifies a ratio of the focal length f1 of the first lens L1 and the focal length f of the camera optical lens 10. If the lower limit of the specified value is exceeded, although it would facilitate development of ultra-thin lenses, the positive refractive power of the first lens L1 will be too strong, and thus it is difficult to correct the problem like the aberration and it is also unfavorable for development of wide-angle lenses. On the contrary, if the upper limit of the specified value is exceeded, the positive refractive power of the first lens L1 would become too weak, and it is then difficult to develop ultra-thin lenses. Preferably, 2.85≤f1/f≤5.62.

A curvature radius of the object side surface of the first lens L1 is defined as R1, and a curvature radius of the image side surface of the first lens L1 is defined as R2. The camera optical lens 10 further satisfies a condition of −20.99≤(R1+R2)/(R1−R2)≤−4.70. This can reasonably control a shape of the first lens L1 in such a manner that the first lens L1 can effectively correct a spherical aberration of the camera optical lens. Preferably, −13.12≤(R1+R2)/(R1−R2)≤−5.87.

An on-axis thickness of the first lens L1 is defined as d1. The camera optical lens 10 further satisfies a condition of 0.05≤d1/TTL≤0.18. This facilitates achieving ultra-thin lenses. Preferably, 0.09≤d1/TTL≤0.15.

In this embodiment, the object side surface of the second lens L2 is convex in the paraxial region, and the image side surface of the second lens L2 is convex in the paraxial region.

The focal length of the camera optical lens 10 is f, and a focal length of the second lens L2 is f2. The camera optical lens 10 further satisfies a condition of 9.51×10⁴≤f2/f≤8.59×10⁶. By controlling the positive refractive power of the second lens L2 within the reasonable range, correction of the aberration of the optical system can be facilitated. Preferably, 1.52×10⁵≤f2/f≤6.87×10⁶.

An on-axis thickness of the second lens L2 is defined as d3. The camera optical lens 10 further satisfies a condition of 0.01≤d3/TTL≤0.02. This facilitates achieving ultra-thin lenses.

In this embodiment, the object side surface of the third lens L3 is convex in the paraxial region, and the image side surface of the third lens L3 is concave in the paraxial region.

The focal length of the camera optical lens 10 is f, and a focal length of the third lens L3 is f3. The camera optical lens 10 further satisfies a condition of −7.94≤f3/f≤−2.05. When the condition is satisfied, the field curvature of the system can be effectively balanced for further improving the image quality. Preferably, −4.96≤f3/f≤−2.57.

A curvature radius of the object side surface of the third lens L3 is defined as R5, and a curvature radius of the image side surface of the third lens L3 is defined as R6. The camera optical lens 10 further satisfies a condition of 0.55≤(R5+R6)/(R5−R6)≤2.67. This can effectively control a shape of the third lens L3, thereby facilitating shaping of the third lens L3 and avoiding bad shaping and generation of stress due to the overly large surface curvature of the third lens L3. Preferably, 0.89≤(R5+R6)/(R5−R6)≤2.14.

An on-axis thickness of the third lens L3 is defined as d5. The camera optical lens 10 further satisfies a condition of 0.02≤d5/TTL≤0.05. This facilitates achieving ultra-thin lenses. Preferably, 0.02≤d5/TTL≤0.04.

In this embodiment, an object side surface of the fourth lens L4 is convex in the paraxial region, an image side surface of the fourth lens L4 is concave in the paraxial region, and the fourth lens L4 has a positive refractive power.

The focal length of the camera optical lens 10 is f, and a focal length of the fourth lens L4 is f4. The camera optical lens 10 further satisfies a condition of 1.29≤f4/f≤4.16. The appropriate distribution of the refractive power leads to a better imaging quality and a lower sensitivity. Preferably, 2.07≤f4/f≤3.33.

A curvature radius of the object side surface of the fourth lens L4 is defined as R7, and a curvature radius of the image side surface of the fourth lens L4 is defined as R8. The camera optical lens 10 further satisfies a condition of −26.07≤(R7+R8)/(R7−R8)≤−8.58, which specifies a shape of the fourth lens L4. Out of this range, a development towards ultra-thin and wide-angle lenses would make it difficult to correct the problem like an off-axis aberration. Preferably, −16.30≤(R7+R8)/(R7−R8)≤−10.73.

An on-axis thickness of the fourth lens L4 is defined as d7. The camera optical lens 10 further satisfies a condition of 0.01≤d7/TTL≤0.03. This facilitates achieving ultra-thin lenses. Preferably, 0.01≤d7/TTL≤0.02.

In this embodiment, an object side surface of the fifth lens L5 is convex in the paraxial region, an image side surface of the fifth lens L5 is convex in the paraxial region, and the fifth lens L5 has a positive refractive power.

The focal length of the camera optical lens 10 is f, and a focal length of the fifth lens L5 is f5. The camera optical lens 10 further satisfies a condition of 0.37≤f5/f≤1.16. This can effectively make a light angle of the camera lens gentle and reduce the tolerance sensitivity. Preferably, 0.59≤f5/f≤0.93.

A curvature radius of the object side surface of the fifth lens L5 is defined as R9, and a curvature radius of the image side surface of the fifth lens L5 is defined as R10. The camera optical lens 10 further satisfies a condition of −0.71≤(R9+R10)/(R9−R10)≤−0.12, which specifies a shape of the fifth lens L5. Out of this range, a development towards ultra-thin and wide-angle lenses would make it difficult to correct the problem like an off-axis aberration. Preferably, −0.44≤(R9+R10)/(R9−R10)≤−0.15.

An on-axis thickness of the fifth lens L5 is defined as d9. The camera optical lens 10 further satisfies a condition of 0.07≤d9/TTL≤0.27. This facilitates achieving ultra-thin lenses. Preferably, 0.12≤d9/TTL≤0.21.

In this embodiment, an object side surface of the sixth lens L6 is concave in the paraxial region, an image side surface of the sixth lens L6 is concave in the paraxial region, and the sixth lens L6 has a negative refractive power.

The focal length of the camera optical lens 10 is f, and a focal length of the sixth lens L6 is f6. The camera optical lens 10 further satisfies a condition of −1.55≤f6/f≤−0.49. The appropriate distribution of the refractive power leads to a better imaging quality and a lower sensitivity. Preferably, −0.97≤f6/f≤−0.61.

A curvature radius of the object side surface of the sixth lens L6 is defined as R11, and a curvature radius of the image side surface of the sixth lens L6 is defined as R12. The camera optical lens 10 further satisfies a condition of 0.05≤(R11+R12)/(R11−R12)≤0.19, which specifies a shape of the sixth lens L6. Out of this range, a development towards ultra-thin and wide-angle lenses would make it difficult to correct the problem like an off-axis aberration. Preferably, 0.08≤(R11+R12)/(R11−R12)≤0.15.

A thickness on-axis of the sixth lens L6 is defined as d11. The camera optical lens 10 further satisfies a condition of 0.06≤d11/TTL≤0.20. This facilitates achieving ultra-thin lenses. Preferably, 0.10≤d11/TTL≤0.16.

In this embodiment, the focal length of the camera optical lens 10 is f, and a combined focal length of the first lens L1 and the second lens L2 is f12. The camera optical lens 10 further satisfies a condition of 1.78≤f12/f≤7.00. This can eliminate the aberration and distortion of the camera optical lens while suppressing a back focal length of the camera optical lens, thereby maintaining miniaturization of the camera optical lens. Preferably, 2.84≤f12/f≤5.60.

In this embodiment, the total optical length TTL of the camera optical lens 10 is smaller than or equal to 5.52 mm, which is beneficial for achieving ultra-thin lenses. Preferably, the total optical length TTL of the camera optical lens 10 is smaller than or equal to 5.27 mm.

In this embodiment, the camera optical lens 10 has a large F number, which is smaller than or equal to 2.27. The camera optical lens 10 has a better imaging performance. Preferably, the F number of the camera optical lens 10 is smaller than or equal to 2.22.

With such design, the total optical length TTL of the camera optical lens 10 can be made as short as possible, and thus the miniaturization characteristics can be maintained.

In the following, examples will be used to describe the camera optical lens 10 of the present disclosure. The symbols recorded in each example will be described as follows. The focal length, on-axis distance, curvature radius, on-axis thickness, inflexion point position, and arrest point position are all in units of mm.

TTL: Optical length (the total optical length from the object side surface of the first lens to the image plane of the camera optical lens along the optic axis) in mm.

Preferably, inflexion points and/or arrest points can be arranged on the object side surface and/or image side surface of the lens, so as to satisfy the demand for the high quality imaging. The description below can be referred to for specific implementations.

The design information of the camera optical lens 10 in Embodiment 1 of the present disclosure is shown in Tables 1 and 2.

TABLE 1 R d nd vd S1 ∞ d0 = −0.158 R1 2.179 d1 = 0.521 nd1 1.5444 v1 56.06 R2 2.900 d2 = 0.058 R3 8.591 d3 = 0.074 nd2 1.6713 v2 19.24 R4 8.561 d4 = 0.253 R5 283.165 d5 = 0.152 nd3 2.3600 v3 23.60 R6 14.363 d6 = 0.141 R7 1.049 d7 = 0.094 nd4 1.6497 v4 21.45 R8 1.223 d8 = 0.481 R9 2.157 d9 = 0.709 nd5 1.5444 v5 56.06 R10 −4.517 d10= 0.814 R11 −3.435 d11 = 0.652 nd6 1.5352 v6 56.11 R12 2.808 d12 = 0.300 R13 ∞ d13 = 0.110 ndg 1.5168 vg 64.17 R14 ∞ d14 = 0.469 In the table, meanings of various symbols will be described as follows. S1: aperture; R: curvature radius of an optical surface, a central curvature radius for a lens; R1: curvature radius of the object side surface of the first lens L1; R2: curvature radius of the image side surface of the first lens L1; R3: curvature radius of the object side surface of the second lens L2; R4: curvature radius of the image side surface of the second lens L2; R5: curvature radius of the object side surface of the third lens L3; R6: curvature radius of the image side surface of the third lens L3; R7: curvature radius of the object side surface of the fourth lens L4; R8: curvature radius of the image side surface of the fourth lens L4; R9: curvature radius of the object side surface of the fifth lens L5; R10: curvature radius of the image side surface of the fifth lens L5; R11: curvature radius of the object side surface of the sixth lens L6; R12: curvature radius of the image side surface of the sixth lens L6; R13: curvature radius of an object side surface of the optical filter GF; R14: curvature radius of an image side surface of the optical filter GF; d: on-axis thickness of a lens and an on-axis distance between lenses; d0: on-axis distance from the aperture S1 to the object side surface of the first lens L1; d1: on-axis thickness of the first lens L1; d2: on-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2; d3: on-axis thickness of the second lens L2; d4: on-axis distance from the image side surface of the second lens L2 to the object side surface of the third lens L3; d5: on-axis thickness of the third lens L3; d6: on-axis distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4; d7: on-axis thickness of the fourth lens L4; d8: on-axis distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5; d9: on-axis thickness of the fifth lens L5; d10: on-axis distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6; d11: on-axis thickness of the sixth lens L6; d12: on-axis distance from the image side surface of the sixth lens L6 to the object side surface of the optical filter GF; d13: on-axis thickness of the optical filter GF; d14: on-axis distance from the image side surface of the optical filter GF to the image plane; nd: refractive index of d line; nd1: refractive index of d line of the first lens L1; nd2: refractive index of d line of the second lens L2; nd3: refractive index of d line of the third lens L3; nd4: refractive index of d line of the fourth lens L4; nd5: refractive index of d line of the fifth lens L5; nd6: refractive index of d line of the sixth lens L6; ndg: refractive index of d line of the optical filter GF; vd: abbe number; v1: abbe number of the first lens L1; v2: abbe number of the second lens L2; v3: abbe number of the third lens L3; v4: abbe number of the fourth lens L4; v5: abbe number of the fifth lens L5; v6: abbe number of the sixth lens L6; vg: abbe number of the optical filter GF.

Table 2 shows aspherical surface data of the camera optical lens 10 in Embodiment 1 of the present disclosure.

TABLE 2 Conic coefficient Aspherical surface coefficients k A4 A6 A8 A10 A12 R1 −3.1522E−01 0.32223606 −2.519383274 10.93232082 −28.899682 48.20783795 R2   9.2108E+00 −0.457665755 4.627821666 −25.15257408 68.01729042 −102.2984961 R3   9.9000E+01 −0.284396206 4.574307042 −26.24719702 71.48862786 −106.0981326 R4 −3.5976E+01 −0.1693442 3.078802414 −17.8883141 52.66973302 −90.28457299 R5   4.2000E+03 −0.244456087 1.489586004 −6.749379662 16.74505335 −24.81451836 R6 −1.2029E+03 −0.324680391 1.645378097 −5.724765716 9.745644862 −5.480520184 R7 −4.2868E+01 −0.441586477 1.432805947 −3.070705651 3.712975855 −3.081824948 R8 −4.1194E+01 −0.583405521 1.658532407 −3.165567066 3.286181882 −1.800588226 R9 −6.1374E+00 −0.652600504 1.603247792 −2.768104515 3.563089827 −3.130580333 R10 −1.1932E+01 −0.741684287 1.643128181 −4.004592456 9.064065591 −11.82774684 R11 −3.4257E−01 −4.214871186 11.82603457 −17.0389301 16.14699021 −1.06E+01 R12 −9.4149E+00 −8.571916483 37.16397706 −88.38699986 135.9238743 −1.41E+02 Aspherical surface coefficients A14 A16 A18 A20 R1  −50.97672408 33.10395032 −12.02561902 1.86693172 R2  86.81587877 −39.04606602 7.709278152 −0.415501216 R3  88.31175763 −38.82226673 7.116881152 −0.061584548 R4  95.12504787 −60.83968903 21.38949493 −3.017348559 R5  22.08308288 −10.63909584 1.647243504 0.391757784 R6  −7.686684058 15.75174722 −10.78863708 2.744418662 R7  2.3256976 −1.577045967 0.66069114 −0.113494408 R8  0.399754893 0.058652027 −0.045634832 0.006260593 R9  1.729981572 −0.567363487 0.100668664 −0.007449632 R10 8.65721733 −3.562037305 7.66E−01 −6.59E−02 R11 4.85E+00 −1.45E+00 2.57E−01 −2.03E−02 R12 9.74E+01 −4.32E+01 1.11E+01 −1.26E+00

Here, K is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are aspheric surface coefficients.

IH: Image Height y=(x ² /R)/[1+{1−(k+1)(x ² /R ²)}^(1/2)]+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰ +A12x ¹² +A14x ¹⁴ +A16x ¹⁶ +A18x ¹⁸ +A20x ²  (1)

For convenience, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above formula (1). However, the present disclosure is not limited to the aspherical polynomials form shown in the formula (1).

Table 3 and Table 4 show design data of inflexion points and arrest points of respective lens in the camera optical lens 10 according to Embodiment 1 of the present disclosure. P1R1 and P1R2 represent the object side surface and the image side surface of the first lens L1, P2R1 and P2R2 represent the object side surface and the image side surface of the second lens L2, P3R1 and P3R2 represent the object side surface and the image side surface of the third lens L3, P4R1 and P4R2 represent the object side surface and the image side surface of the fourth lens L4, P5R1 and P5R2 represent the object side surface and the image side surface of the fifth lens L5, and P6R1 and P6R2 represent the object side surface and the image side surface of the sixth lens L6. The data in the column named “inflexion point position” refers to vertical distances from inflexion points arranged on each lens surface to the optic axis of the camera optical lens 10. The data in the column named “arrest point position” refers to vertical distances from arrest points arranged on each lens surface to the optic axis of the camera optical lens 10.

TABLE 3 Number of Inflexion point Inflexion point inflexion points position 1 position 2 P1R1 0 P1R2 1 0.385 P2R1 2 0.355 0.545 P2R2 2 0.405 0.455 P3R1 2 0.035 0.785 P3R2 1 0.115 P4R1 1 0.215 P4R2 1 0.215 P5R1 1 1.265 P5R2 2 0.955 1.525 P6R1 1 1.005 P6R2 2 0.335 1.085

TABLE 4 Number of Arrest point Arrest point arrest points position 1 position 2 P1R1 0 P1R2 1 0.725 P2R1 2 0.535 0.545 P2R2 0 P3R1 1 0.045 P3R2 1 0.205 P4R1 1 0.575 P4R2 1 0.505 P5R1 0 P5R2 0 P6R1 0 P6R2 2 0.645 1.615

FIG. 2 and FIG. 3 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm after passing the camera optical lens 10 according to Embodiment 1. FIG. 4 illustrates a field curvature and a distortion of light with a wavelength of 555 nm after passing the camera optical lens 10 according to Embodiment 1, in which a field curvature S is a field curvature in a sagittal direction and T is a field curvature in a tangential direction.

Table 9 shows various values of Embodiments 1 and 2 and values corresponding to parameters which are specified in the above conditions.

As shown in Table 9, Embodiment 1 satisfies the above conditions.

In this embodiment, the entrance pupil diameter of the camera optical lens is 1.630 mm. The image height of 1.0 H is 2.934 mm. The FOV (field of view) is 77.45°. Thus, the camera optical lens has a wide-angle and is ultra-thin. Its on-axis and off-axis chromatic aberrations are fully corrected, thereby achieving excellent optical characteristics.

Embodiment 2

Embodiment 2 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

Table 5 and Table 6 show design data of a camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 5 R d nd vd S1 ∞ d0 = −0.149 R1 2.346 d1 = 0.607 nd1 1.5444 v1 56.06 R2 2.840 d2 = 0.054 R3 9.196 d3 = 0.074 nd2 1.6713 v2 19.24 R4 9.167 d4 = 0.191 R5 51.186 d5 = 0.152 nd3 2.3600 v3 23.60 R6 14.363 d6 = 0.128 R7 1.149 d7 = 0.094 nd4 1.6497 v4 21.45 R8 1.342 d8 = 0.464 R9 2.371 d9 = 0.887 nd5 1.5444 v5 56.06 R10 −3.376 d10 = 0.747 R11 −3.435 d11 = 0.652 nd6 1.5352 v6 56.11 R12 2.676 d12 = 0.300 R13 ∞ d13 = 0.110 ndg 1.5168 vg 64.17 R14 ∞ d14 = 0.556

Table 6 shows aspherical surface data of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 6 Conic coefficient Asphencal surface coefficients k A4 A6 A8 A10 A12 R1 −6.18E−01 0.316375089 −2.62096209 12.00572272 −33.4760778 58.88082734 R2   8.30E+00 −0.412562917 4.788623338 −27.15288184 82.47553932 −160.6555484 R3   9.90E+01 −0.485728325 6.934738264 −39.16897417 107.7880664 −162.5033569 R4 −2.36E+01 −0.270429671 3.11853684 −15.77090734 40.99423579 −62.10819849 R5   4.20E+03 −0.21677648 1.149734735 −4.267386997 8.435934169 −9.109199304 R6 −1.20E+03 −0.314257516 1.741235215 −6.312168376 13.14358122 −16.47953435 R7 −4.64E+01 −0.224040432 0.771489934 −1.778490121 2.719930357 −3.412495934 R8 −4.33E+01 −0.252487873 0.517837312 −0.521057002 −0.200925528 0.744385979 R9 −5.84E+00 −0.518634395 1.189826056 −1.779295032 2.019225026 −1.505573855 R10 −2.61E+01 −0.943363645 1.997419557 −3.824059389 6.208600551 −5.366549949 R11 −3.43E−01 −3.624773836 9.431571387 −12.60188574 11.07472886 −6.769385984 R12 −9.92E+00 −7.275857684 32.06931939 −76.97887167 119.7967302 −126.181616 Asphencal surface coefficients A14 A16 A18 A20 R1  −65.65733533 44.96552433 −17.22594802 2.819709328 R2  209.7943723 −177.2665784 86.58030431 −18.33873769 R3  135.8050999 −56.64016103 7.007842629 1.246353939 R4  59.64367687 −37.63446695 14.80225222 −2.737014041 R5  4.595365688 0.218783812 −1.28831252 0.406125061 R6  12.15341474 −4.541782977 0.349593155 0.177318385 R7  3.129023226 −1.766358207 0.530755912 −0.064618397 R8  −0.578560627 0.214514117 −0.039533684 0.002910133 R9  0.685635386 −0.18334842 0.026464902 −0.001592388 R10 1.977988008 0.04774208 −0.227575276 0.044034405 R11 2.860504321 −0.795424056 0.130512648 −0.009546517 R12 89.3406858 −40.65187131 10.71242108 −1.239839592

Table 7 and table 8 show design data of inflexion points and arrest points of respective lens in the camera optical lens 20 according to Embodiment 2 of the present disclosure.

TABLE 7 Number of Inflexion point Inflexion point inflexion points position 1 position 2 P1R1 1 0.845 P1R2 2 0.415 0.815 P2R1 2 0.365 0.575 P2R2 2 0.355 0.505 P3R1 1 0.055 P3R2 1 0.095 P4R1 1 0.245 P4R2 1 0.235 P5R1 0 P5R2 1 0.945 P6R1 1 1.005 P6R2 2 0.365 1.045

TABLE 8 Number of Arrest point Arrest point arrest points position 1 position 2 P1R1 0 P1R2 1 0.645 P2R1 2 0.485 0.665 P2R2 0 P3R1 1 0.095 P3R2 1 0.185 P4R1 1 0.595 P4R2 1 0.555 P5R1 0 P5R2 1 1.315 P6R1 0 P6R2 2 0.745 1.345

FIG. 6 and FIG. 7 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm after passing the camera optical lens 20 according to Embodiment 2. FIG. 8 illustrates a field curvature and a distortion of light with a wavelength of 555 nm after passing the camera optical lens 20 according to Embodiment 2.

As shown in Table 9, Embodiment 2 satisfies the above conditions.

In this embodiment, the entrance pupil diameter of the camera optical lens is 1.672 mm. The image height of 1.0 H is 2.934 mm. The FOV (field of view) is 76.01°. Thus, the camera optical lens has a wide-angle and is ultra-thin. Its on-axis and off-axis chromatic aberrations are fully corrected, thereby achieving excellent optical characteristics.

Table 9 in the following lists values corresponding to the respective conditions in this embodiment in order to satisfy the above conditions.

TABLE 9 Parameters and conditions Embodiment 1 Embodiment 2 f 3.584 3.678 f1 12.788 17.219 f2 681733.641 21059651.994 f3 −1.104E+01 −1.460E+01 f4 9.259 10.198 f5 2.777 2.697 f6 −2.776 −2.701 f12 12.743 17.163 Fno 2.20 2.20 f1/f3 −1.16 −1.18 R5/R6 19.71 3.56

It can be appreciated by one having ordinary skill in the art that the description above is only embodiments of the present disclosure. In practice, one having ordinary skill in the art can make various modifications to these embodiments in forms and details without departing from the spirit and scope of the present disclosure. 

What is claimed is:
 1. A camera optical lens, comprising, from an object side to an image side: a first lens having a positive refractive power; a second lens having a positive refractive power; a third lens having a negative refractive power; a fourth lens having a positive refractive power; a fifth lens having a positive refractive power; and a sixth lens having a negative refractive power, wherein the camera optical lens satisfies the following conditions: −5.59≤f1/f3≤−1.08; 3.28≤R5/R6≤19.86; and 338.48≤(R3+R4)/(R3−R4), where f1 denotes a focal length of the first lens; f3 denotes a focal length of the third lens; R3 denotes a curvature radius of an object side surface of the second lens; R4 denotes a curvature radius of an image side surface of the second lens; R5 denotes a curvature radius of an object side surface of the third lens; and R6 denotes a curvature radius of an image side surface of the third lens.
 2. The camera optical lens as described in claim 1, wherein the first lens comprises an object side surface being convex in a paraxial region and an image side surface being concave in the paraxial region, and the camera optical lens further satisfies the following conditions: 1.78≤f1/f≤7.02; −20.99≤(R1+R2)/(R1−R2)≤−4.70; and 0.05≤d1/TTL≤0.18, where f denotes a focal length of the camera optical lens; R1 denotes a curvature radius of the object side surface of the first lens; R2 denotes a curvature radius of the image side surface of the first lens; d1 denotes an on-axis thickness of the first lens; and TTL denotes a total optical length from the object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 3. The camera optical lens as described in claim 2, further satisfying the following conditions: 2.85≤f1/f≤5.62; −13.12≤(R1+R2)/(R1−R2)≤−5.87; and 0.09≤d1/TTL≤0.15.
 4. The camera optical lens as described in claim 1, wherein the second lens comprises an object side surface being convex in a paraxial region and an image side surface being concave in the paraxial region, and the camera optical lens further satisfies the following conditions: 9.51×10⁴≤f2/f≤8.59×10⁶; and 0.01≤d3/TTL≤0.02, where f denotes a focal length of the camera optical lens; f2 denotes the focal length of the second lens; d3 denotes an on-axis thickness of the second lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 5. The camera optical lens as described in claim 4, further satisfying the following conditions: 1.52×10⁵≤f2/f≤6.87×10⁶.
 6. The camera optical lens as described in claim 1, wherein the third lens comprises an object side surface being convex in a paraxial region and an image side surface being concave in the paraxial region, and the camera optical lens further satisfies the following conditions: −7.94≤f3/f≤−2.05; 0.55≤(R5+R6)/(R5−R6)≤2.67; and 0.02≤d5/TTL≤0.05, where f denotes a focal length of the camera optical lens; d5 denotes an on-axis thickness of the third lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 7. The camera optical lens as described in claim 6, further satisfying the following conditions: −4.96≤f3/f≤−2.57; 0.89≤(R5+R6)/(R5−R6)≤2.14; and 0.02≤d5/TTL≤0.04.
 8. The camera optical lens as described in claim 1, wherein the fourth lens comprises an object side surface being convex in a paraxial region and an image side surface being concave in the paraxial region, and the camera optical lens further satisfies the following conditions: 1.29≤f4/f≤4.16; −26.07≤(R7+R8)/(R7−R8)≤−8.58; and 0.01≤d7/TTL≤0.03, where f denotes a focal length of the camera optical lens; f4 denotes a focal length of the fourth lens; R7 denotes a curvature radius of the object side surface of the fourth lens; R8 denotes a curvature radius of the image side surface of the fourth lens; d7 denotes an on-axis thickness of the fourth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 9. The camera optical lens as described in claim 8, further satisfying the following conditions: 2.07≤f4/f≤3.33; −16.30≤(R7+R8)/(R7−R8)≤−10.73; and 0.01≤d7/TTL≤0.02.
 10. The camera optical lens as described in claim 1, wherein the fifth lens comprises an object side surface being convex in a paraxial region and an image side surface being convex in the paraxial region, and the camera optical lens further satisfies the following conditions: 0.37≤f5/f≤1.16; −0.71≤(R9+R10)/(R9−R10)≤−0.12; and 0.07≤d9/TTL≤0.27, where f denotes a focal length of the camera optical lens; f5 denotes a focal length of the fifth lens; R9 denotes a curvature radius of the object side surface of the fifth lens; R10 denotes a curvature radius of the image side surface of the fifth lens; d9 denotes an on-axis thickness of the fifth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 11. The camera optical lens as described in claim 10, further satisfying the following conditions: 0.59≤f5/f≤0.93; −0.44≤(R9+R10)/(R9−R10)≤−0.15; and 0.12≤d9/TTL≤0.21.
 12. The camera optical lens as described in claim 1, wherein the sixth lens comprises an object side surface being concave in a paraxial region and an image side surface being concave in the paraxial region, and the camera optical lens further satisfies the following conditions: −1.55≤f6/f≤−0.49; 0.05≤(R11+R12)/(R11−R12)≤0.19; and 0.06≤d11/TTL≤0.20, where f denotes a focal length of the camera optical lens; f6 denotes a focal length of the sixth lens; R11 denotes a curvature radius of the object side surface of the sixth lens; R12 denotes a curvature radius of the image side surface of the sixth lens; d11 denotes an on-axis thickness of the sixth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 13. The camera optical lens as described in claim 12, further satisfying the following conditions: −0.97≤f6/f≤−0.61; 0.08≤(R11+R12)/(R11−R12)≤0.15; and 0.10≤d11/TTL≤0.16.
 14. The camera optical lens as described in claim 1, further satisfying the following condition: 1.78≤f12/f≤7.00, where f denotes a focal length of the camera optical lens; and f12 denotes a combined focal length of the first lens and the second lens.
 15. The camera optical lens as described in claim 14, further satisfying the following condition: 2.84≤f12/f≤5.60.
 16. The camera optical lens as described in claim 1, wherein a total optical length TTL from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis is smaller than or equal to 5.52 mm.
 17. The camera optical lens as described in claim 16, wherein the total optical length TTL of the camera optical lens is smaller than or equal to 5.27 mm.
 18. The camera optical lens as described in claim 1, wherein an F number of the camera optical lens is smaller than or equal to 2.27.
 19. The camera optical lens as described in claim 18, wherein the F number of the camera optical lens is smaller than or equal to 2.22. 